3 Monocerotis, a blue giant star in Monoceros
3 Monocerotis is a blue giant star in the constellation Monoceros. At 768 light years away, it shines at an apparent visual magnitude of 4.92.
3 Monocerotis (HIP 28574)
3 Monocerotis is a blue giant star in the constellation Monoceros. At 768 light years away, it shines at an apparent visual magnitude of 4.92. 3 Monocerotis is a multiple-star system. It is moving through the Galaxy at a speed of 40.6 km/s relative to the Sun. Its projected Galactic orbit carries it between 22,700 and 25,400 light years from the center of the Galaxy. It came closest to the Sun 5.4 million years ago when it had brightened to magnitude 2.17 from a distance of 216 light years.
Sky position: RA 6h 1.8m, Dec -10° 36'
Common designations: 3 Monocerotis, HIP 28574, HD 40967
Brightest stars in Monoceros:
(list all)
| Rank | Mag. | Star |
| 4 | 4.15 | Delta Monocerotis |
| 5 | 4.36 | Zeta Monocerotis |
| 6 | 4.39 | Epsilon Monocerotis A |
| 7 | 4.47 | 13 Monocerotis |
| 8 | 4.48 | 18 Monocerotis |
| 9 | 4.66 | 15 Monocerotis |
| 10 | 4.69 | 28 Monocerotis |
| 11 | 4.77 | 17 Monocerotis |
| 12 | 4.91 | 20 Monocerotis |
13
| 4.92
) 3 Monocerotis
| Rank | Mag. | Star |
| 14 | 4.93 | 27 Monocerotis |
| 15 | 4.99 | 19 Monocerotis |
| 16 | 5.04 | 2 Monocerotis |
| 17 | 5.06 | HR 2205 |
| 18 | 5.06 | 10 Monocerotis |
| 19 | 5.08 | Lalande 13100 |
| 20 | 5.09 | HR 2395 |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of 3 Monocerotis
(compared to the Sun)
E
ccentricity: 5.6% vs. 16.0%Angle φ : -123.3°vs. 26.0°
Semi-major axis : 7,372 pc vs. 8,686 pc
Semi-minor axis: 7,360 pc vs. 8,574 pc
Focus-to-center
: 414 pcvs. 1,388 pcSemilatus rectum : 7,349 pc vs. 8,464 pc
Perigalacticon: 6,957 pc vs. 7,297 pc
Apogalacticon
: 7,786 pcvs. 10,074 pcSome Tabulated XHIP Data for 3 Monocerotis
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 90.46010793° ±0.41 mas | -9.10 ±2.00 mas/yr. |
| Declination: | -10.59793952° ±0.38 mas | -4.70 ±1.90 mas/yr. |
| Galactic Longitude: | 216.95042148° | 0.34 mas/yr. |
| Galactic Latitude: | -15.76576374° | -10.24 mas/yr. |
Parallax: 4.16 ± 0.55 mas
Spectrography
Spectral Type: B5 III/V 1999MSS...C05....0H.
Radial Velocity: 39.00 ±4.20 km/s [A rating] 2006AstL...32..759G.
Iron Abundance [Fe/H]:
n/a
Photometry
band
magnitude
Abs. Mag.
U
4.24
-2.62
B
4.79
-2.07
V
4.92
-1.94
R
I
5.06
-1.80
J
5.15
-1.71
H
5.20
-1.66
K
5.17
-1.69
B-V: -0.13 V-I: -0.14
Derivations
Heliocentric distance: 235.45 pc (13.2% margin of error)
Galactocentric distance: 7,582 pc
Transverse velocity: 11.4 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | -181.1 pc | -136.2 pc | -64.0 pc |
| Velocity (U, V, W) | -27.3 km/s | -21.0 km/s | -21.6 km/s |